Adding a `pre-blame` hook to `git`

blame.patch

diff --git a/Documentation/githooks.txt b/Documentation/githooks.txt
index 0397dec64d..f9cce044fe 100644
--- a/Documentation/githooks.txt
+++ b/Documentation/githooks.txt
@@ -758,6 +758,12 @@ and "0" meaning they were not.
 Only one parameter should be set to "1" when the hook runs.  The hook
 running passing "1", "1" should not be possible.
 
+pre-blame
+~~~~~~~~~~~~~~
+
+This hook is run before git blame; the exit code is ignored.
+
+
 SEE ALSO
 --------
 linkgit:git-hook[1]
diff --git a/builtin/blame.c b/builtin/blame.c
index e407a22da3..ac81dddb26 100644
--- a/builtin/blame.c
+++ b/builtin/blame.c
@@ -17,6 +17,7 @@
 #include "revision.h"
 #include "quote.h"
 #include "string-list.h"
+#include "hook.h"
 #include "mailmap.h"
 #include "parse-options.h"
 #include "prio-queue.h"
@@ -966,6 +967,8 @@ int cmd_blame(int argc,
 	revs.diffopt.flags.follow_renames = 0;
 	argc = parse_options_end(&ctx);
 
+	run_hooks(the_repository, "pre-blame");
+
 	prepare_repo_settings(the_repository);
 	the_repository->settings.command_requires_full_index = 0;